Header error control schemes for coping with upstream channel noise in the HFC network

The Hybrid Fiber-Coax (HFC) network is being paid close attention to in recent years as a bi-directional broadband access network. To achieve seamless connection with the backbone network, and Asynchronous Transfer Mode (ATM) Network Network Interface (NNI) cell format is used as the basic transmission packet unit in the HFC system. As the transmission condition of the HFC system’s upstream channel is bad, two improved header error control (HEC) schemes, i. e. the improved HEC and the cell interleaving technique, are employed to guarantee the packet integrity. Theoretical analysis of the results showed that the improved HEC and the cell interleaving technique are applicable to isolated random errors and burst errors, respectively.     

HEADER ERROR CONTROL SCHEMES FOR COPING WITH UPSTREAM CHANNEL NOISE IN THE HFC NETWORK

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试论实验技术队伍建设

实验技术人员的素质和整体效能关系到培养合格人才的问题，还直接影响到实验教学和科研工作的效果。因此．加强高校实验技术队伍整体素质建设，探讨提高实验技术人员水平的途径和建设高素质实验技术队伍的措施是非常必要的。     

ISM-CMAP-Combine (ICMC) for hierarchical knowledge scenario in quality engineering education

Quality assurance in engineering education is a multifaceted problem further augmented by the stakeholders of engineering education. Students, parents and employers are rightfully questioning the quality of the curriculum, the instructional delivery, the learning environment, accessibility to learning technologies and equipment, employability as well as the possibilities of lifelong learning and the improvement of knowledge (Karapetrovic 2002 Karapetrovic, S. 2002. Why and how to develop a meaningful quality assurance system in engineering schools. Int. J. Engg. Educ, 18(3): 285–294. [Web of Science ®] [Google Scholar]). The purpose of the study is, therefore, to identify the parameters that influence the quality of an engineering education system and develop an integrated model of hierarchical structuring and a concept map for pre-identified concept elements through a process of iterative-interactive consensus-driven methodology, as advocated by second-generation system design paradigm for evolving knowledge scenario of concepts related to quality engineering education.     

《电路与电子技术》课程研究及教学方法探讨

《电路与电子技术》课程的特点是理论性强,同时技术性、实践性也很强,这就使得学生在学习的过程中感觉理论内容太过枯燥,定理公式繁多难以记忆,从而丧失对该课程学习的兴趣。从课堂教学与实践教学两个环节上对该课程教学进行研究,注重理论与实践相结合,将引导法与项目法贯穿在教学过程中,可以收到良好的效果。     

2005-2006赛季CBA中外球员技术特点分析

以2005-2006 CBA联赛中的外援中锋、前锋、后卫球员与国内中锋、前锋、后卫球员为主要对象,采用文献资料法、逻辑分析法、对比分析法进行研究,主要从比赛中的若干技术指标方面进行分析,发现国内球员在三分投篮命中率、助攻、罚球命中率方面相比外援球员有一定的优势且失误比外援少,但在二分球命中率、篮板球、抢断、快攻、身体对抗以及场均得分方面不如外援球员。因此,要正确使用外援,充分借鉴外援的优势,提高国内球员在强对抗情况下的技术运用能力,以此来推动CBA联赛向更高层次的发展。     

优秀散打运动员膝/肘关节等速测试与站位攻防技术分析

采用ISOMED2000等速系统检测优秀散打运动员膝、肘关节肌群的生物力学特征,分析优秀散打运动员站位攻防动作技术.在进攻训练中伸膝关节速度达到300°/s,能充分发挥运动员小腿伸肌群的爆发能力;采用300°/s的速度可以快速屈小腿,有利于运动员快速回防,为再次打击对方在时间上创造了条件;在站位时,膝关节角度保持157.3°～160.1°,小腿屈肌群离心爆发能力强,有利于运动员调整自身的身体姿势,避开对方的快速进攻.在进攻训练中应使肘关节速度达到300°/s,能充分发挥运动员前臂伸肌群的爆发能力.肘关节角度在81°～86°的范围,有利于运动员快速出拳,打击对方.以240°/s的速度屈肘,能充分发挥运动员前臂屈肌群的爆发能力,有利于运动员快速回防.在防守训练中,肘关节角度在78°～85°的范围内,对运动员快速回防,抵御时方快速、重拳的进攻是有利的;肘关节角度在128°～137°的范围内,可远距离隔挡对方,阻击对方的快速进攻.     

浅谈双关语翻译技巧

双关语历来是汉英翻译的一个难点,文章首先指出其可译性,然后在对双关语翻译的困难和局融陛分析的基础上,探讨了双关语英译的几点技巧和方法。     

浅谈足球运动员技战术意识的培养

通过采用观察分析的方法,对足球运动员在比赛中意识好、坏进行分析,结果表明：足球运动员技战术的高低取决于系统的训练及个人文化层次的高低。     

浅析改进赛艇技术和提高运动成绩的关系

阐述了赛艇运动的基本划法、技术关键、技术风格等问题,分析了评价赛艇技术好坏的关键因素,研究认为：具有完善技术的船速变化相对平均船速的差值小,曲线变化不大;而划桨技术不好的船速变化相对于平均船速差值要大得多。